I needed to figure out why my A/C was ice cold in the front but blowing warm in the second and third rows. I ended up teaching myself how these systems work, so I'm sharing the knowledge here for the next person.
In my case it ended up being the rear temperature blend door actuator having a broken gear inside and always directing the air across the heater, instead of opening to the A/C side when the control module told it to switch.
This video shows how the actuators for the temperature blend door and the air direction door work together. The system for front passengers is very similar. I wasn't quite sure how they were supposed to work while I was fixing them (I had only seen the broken one), so I recorded them working together in this video in case it helps someone out. I know I would have LOVED to see this video before I started working on my system.
Негізгі бет Rear (auxiliary) heat and A/C actuator overview/repair for Yukon, Tahoe, Suburban, and Escalade
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